Question

5. Draw two equivalent resonance forms for bicarbonate ion, HCO,. How many sigma bonds are there? How many pi bonds? it). 6. Draw the resonance forms for the formate ion, HCO 2 (Cis central, the other atoms are bonded to (a) How many sigma bonds are there? How many pi bonds? (b) What is the carbon oxygen bond order? (c) Arrange the following species in order of decreasing C-O bond strength (strongest first, weakest last). CO ,CH OH, CO, HCO3 7. Consider the following compounds: Csi, LiBr, and Nal. Answer the following questions based on expected periodic trends: (a) Which is expected to have the shortest ionic bonds? (b) Which is expected to have the highest lattice energy? (c) Which is expected to have the lowest melting point?

Answer 1

Date: Structures for a lon Resonance Lewis Structures ker. molecule Electrons move in different Resonating Structures but no movement - Atoms occurs. :O-H be bolo No. of sigma bonds - 3+ 1 = 4 No. of T bond - 1 Lo ② HCO (Formate Ien) H-C- 0 6 H-C=0: Movement of lone pair of electrons. - on oxygen to foom (= 8 and then already co moves to form Coo Ta No. of signa bonds a Itti: 3 No. of pi bonds : 1

Date: There is Both are exists in Average one not two Bond c=0 and one c-o complete bonds they resonating structures : order : 2+1 = 1.5 0 CO² - CH₂OH, co, Hco I - ord С= 0 - OH 2+ + = Y 33 Bond order in coz Bond in order e Chon - I co = 3 HCO = 1.5 More Bond order → More stronger the beval More Strength

Date: Maximum Shergth lowest strong - co > Ho, co > CHOW 03 a CI LiBr, NaI - NaI forms the strongest by CT and then life brond followed Smallest largest Jonic Tonic Radii Radio Nat Libr. libr NOI -604 Kimol - 819 Kilmal -704 KT/mol Lattice energy is the released when one compound is formed Sodium Iodide has the amount of energy mole of molecule/ from its constituent highut lattice energy

Date: Na I . Libr Cs I 6610 552°C 6216 Lowest Melting point : Libri